348 THE PLEISTOCENE PERIOD. 



About this elevation in Jersey, at Col de la Roque, is a 

 sea-worn shelf which should be taken as belonging to the same 

 beach-level as the South Hill deposit. (See Photo No. 9.) 



In that island also a deposit, found at an elevation of 

 280 feet, is thus described by Mr. Sinel, (Geology of Jersey, 

 p. 30.) " A bed of pebbles, mingled with clay, on the high 

 lands of St. Saviour's, near Princes Tower, and the many 

 pebbles that occur in the brick clays of St. John's and St. 

 Brelade's, are probably of the same period, as may be some 

 marine deposits at almost the same level, at Surtainville, on 

 the Normandy Coast." 



I shall allude to this statement when speaking of the clays, 

 but it is introduced here to give additional weight to levels 

 represented by escarpments along the west of St. Saviour's, 

 especially at the Dos d'Ane Road. 



In Jersey and in the South of England well eroded plat- 

 forms exist. 



It will thus be seen that evidence exists of sea-levels at 

 practically all elevations from O.D. to 300 feet. Using this 

 evidence I formulate a progressive rise of the sea-level. Here 

 I am met by a definite statement by our Jersey friends, that 

 the order of deposition is the reverse in Jersey. I have, 

 therefore, to show that there are connecting deposits in this 

 island, which I shall speak of as Passage Beds. 



Before bringing the Passage Beds into the discussion I 

 shall briefly state the general argument of a pre-glacial sub- 

 mergence as proved by the beaches and caves. 



THE PRE-GLACIAL SUBMERGENCE OF THE 

 ISLAND. 



I have, so far, enumerated the number of different levels 

 which are indicated by the raised beaches and caves to be 

 found on the island. It remains to demonstrate the order of 

 their deposition. 



In Guernsey, the evidence seems to me to prove that the 

 order of the elevation is also the order of the deposition. If 

 this is so, the 25-feet beach is not only the earliest Pleistocene 

 deposit, but it is the first of the raised beaches. 



The first question that needs answering is, are all the 

 beaches of one period ? Of one thing we may be sure, and 

 that is, that they are all pre-glacial. 



There seems to be in the lower beaches a regular succes- 

 sion as the following table shows. 



